New SELECT Popup: Handle keyboard events coming from WebWidget::handleInputEvent.
New SELECT Popup: Handle keyboard events coming from WebWidget::handleInputEvent.

After [1], keyboard events are directly delivered to WebWidget::handleInputEvent
of a PagePopup.

[1] https://codereview.chromium.org/1028893002

BUG=470504

Review URL: https://codereview.chromium.org/1044803002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@192737 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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